4. If you're crazy like me and want to be able to say you came up with a complete method on your own, now you need to look for a parity algorithm. You can do what I did - just do a bunch of crazy moves, keeping track of what you did, to get fairly far away from square, and then do something different to get back to square. If you're lucky, it will change parity, and then you can solve it again, this time knowing you won't get parity. Then I figure you legitimately have a complete solving method.